The grass fire began in Casula on Saturday afternoon and quickly spread through Moorebank, Wattle Grove, Holsworthy, Menai and Heathcote.
The huge bushfire that blackened nearly 2,500 hectares of land in Sydney's south west over the weekend is believed to be the work of an arsonist.
Fire chiefs have ordered crews to backburn in an effort to contain the blaze while simultaneously stopping the fire from advancing toward properties.
It tore through the Holsworthy military range and more than 500 personnel from the Rural Fire Service, Fire and Rescue NSW and the Australian Defence Force battled to protect properties.
Early this morning the threat level decreased to 'watch and act, ' and then again to 'advice, ' but firefighters have urged locals to remain vigilant and have a bush fire survival plan in place.
Once pristine bushland has been ravaged by the fires.
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The bushfire on Sydney's outskirts, which has been burning since Saturday, has so far burnt through more than 2400 hectares.
RFS spokesperson Greg Allan told the AAP that it's believed that believed that some houses have been damaged.
"We have had reports of impact on properties in west Menai and Barden Ridge but our crews at the moment are exclusively focused on fighting the fire", he told AAP.
Residents in the suburbs of Voyager Point, Pleasure Point, Sandy Point and Illawong, Menai and Bangor were warned of the danger of ember attacks as many scrambled with hoses and buckets to protect their houses.
Many residents in Menai made a decision to remain at their homes and were kept busy fighting ember attacks.
Police suspect the blaze was deliberately lit.
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"The strength of the wind, and the dryness of it and the conditions over the weekend - it is miraculous that we're here this morning talking about no homes lost", he said.
Some remembered awful bushfires in the 1990s when homes were destroyed, and were determined to stay and extinguish embers or spot fires as they broke out.
"Still quite a hard day ahead (on Monday)", Rogers told the Nine Network.
"I think it's fair to say that it is highly suspicious, in the absence of any other cause like lightning", he said.
The Transport Management Centre said Heathcote Road remained closed between New Illawarra Road and Macarthur Drive, and there was no forecast for when the road would be reopened.
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